CN210639264U - Pincerlike CT open circuit tester - Google Patents

Abstract

The utility model discloses a pincerlike CT open circuit tester, which comprises a first handle and a second handle, the bottoms of which are connected by a wire, wherein the first handle and the second handle are respectively provided with a square frame, and an operating mechanism is arranged in the square frame; the voltage ring comprises a first voltage arc ring fixedly arranged on the square frame and a second voltage arc ring arranged on the square frame through a movable block; a current ring is arranged on the square frame of the second handle, and the current ring comprises a first current arc ring fixedly arranged on the square frame and a second current arc ring arranged on the square frame through a movable block; the second handle is provided with a control key and a display screen. The utility model discloses whether detecting circuit opens a way under the prerequisite of not breaking the survey CT return circuit, use the structure of two pincers separation, reduced the size and the thickness of keeping silent, reduced the electromagnetic interference between voltage circle and the electric current circle simultaneously, improved the comprehensive and the functionality of detector.

Description

Pincerlike CT open circuit tester

Technical Field

The utility model relates to a power plant's check out test set technical field, especially a pincerlike CT tester of opening a way.

Background

The clamp-on ground resistance tester is also named as a clamp-on ground resistance tester, and is widely applied to ground resistance measurement of electric power, telecommunication, meteorology, oil fields, buildings and industrial electrical equipment. The measuring principle of the clamp-on ground resistance tester is to measure the loop resistance, the jaw part of the clamp meter is composed of a voltage coil and a current coil, the voltage coil provides an excitation signal, an induced electric potential E is formed on the measured loop, a current I is generated in the measured loop under the action of the induced electric potential E, the clamp meter measures the E and the I, and the resistance of the measured loop can be calculated according to the ohm law. The clamp-on grounding resistance tester can also measure the alternating current impedance of the CT loop and is used for judging whether the loop is open or not on the premise of not opening the tested CT loop. The traditional method for detecting the open circuit of the CT loop is to disconnect the loop at the terminal strip, measure the resistance of the loop by using a multimeter, judge whether the CT loop is open or not according to the measured resistance, and recover the measured loop.

However, when the existing pincer-shaped resistance tester is used for directly detecting whether a CT loop is open or not, the jaw of the pincer-shaped resistance tester is large, so that the relatively thin wire is not easy to measure, and the pincer-shaped resistance tester cannot be used in narrow spaces such as a relay protection cabinet. And the traditional pincerlike resistance tester makes voltage coil and current coil together for the pincers body is too thick, can not use in narrow space, and voltage coil and current coil both are too close, and electromagnetic interference easily takes place between the two, therefore current pincerlike resistance tester does not possess the practicality in the work of detecting CT open circuit.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that needs to solve provides a pincerlike CT tester of opening a way, need not the disconnection during detection and is surveyed the CT return circuit, reduces the electromagnetic interference between voltage ring and the electric current circle, improves the comprehensive and the functionality of detector.

In order to solve the technical problem, the utility model adopts the following technical proposal.

The clamp-on CT open-circuit tester comprises a first handle and a second handle, wherein the bottoms of the first handle and the second handle are connected through a conducting wire and used for handheld measurement, square frames are respectively arranged on the first handle and the second handle, and an operating mechanism used for testing is arranged in each square frame; a voltage ring for generating an excitation signal is arranged on the square frame of the first handle, and the voltage ring comprises a first voltage arc-shaped ring fixedly arranged on the square frame and a second voltage arc-shaped ring arranged on the square frame through a movable block; a current ring for measuring induction signals is arranged on the square frame of the second handle, and comprises a first current arc-shaped ring fixedly arranged on the square frame and a second current arc-shaped ring arranged on the square frame through a movable block; and the second handle is provided with a control key for opening and closing the tester and a display screen for displaying measurement information.

Above-mentioned pincerlike CT tester of opening a way, operating device is including setting up the U type piece on the inside lateral wall of square frame, transversely is provided with extrusion spring on the U type piece, and extrusion spring's tip is connected respectively in the bottom of second voltage arc circle and second electric current arc circle, and the bottom of second voltage arc circle and second electric current arc circle still is provided with the connecting rod, is provided with the sliding block on the connecting rod, and the sliding block sliding fit is on the inner wall of the operation panel that the top articulates on the square frame lateral wall.

In the split core CT open circuit tester, two ends of the wire are connected to the bottoms of the first handle and the second handle through BNC interfaces respectively.

Due to the adoption of the technical scheme, the utility model has the following technical progress.

The utility model discloses whether can open a way the detection circuit under the prerequisite of not breaking the survey CT return circuit, use the structure of two pincers separation, reduced size and thickness of keeping silent, easily use in narrow space, reduced the electromagnetic interference between voltage circle and the electric current circle simultaneously, improved the comprehensive and the functionality of detector.

Drawings

Fig. 1 is a schematic structural view of the present invention;

wherein: 1. the electric bicycle comprises a first handle, 2, a second handle, 3, a square frame, 4, a display screen, 5, a conducting wire, 6, a first voltage arc-shaped ring, 7, a second voltage arc-shaped ring, 8, a first current arc-shaped ring, 9, a second current arc-shaped ring, 10, an operating mechanism, 101, a U-shaped block, 102, an extrusion spring, 103, an operating plate, 104, a sliding block, 105, a connecting rod and 11, and a control key.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The clamp-on CT open-circuit tester is structurally shown in fig. 1 and comprises a first handle 1, a second handle 2, a square frame 3, a voltage ring, a current ring, an operating mechanism 10, a control key 11 and a display screen 4. The first handle 1 and the second handle 2 are used for handheld measurement, the square frame 3 is respectively arranged on the first handle 1 and the second handle 2, the voltage coil is arranged on the square frame 3 and used for providing an excitation signal and generating induced potential and induced current, the current coil is arranged on the square frame 3 and used for measuring the induced current signal, the operating mechanism 10 is arranged in the square frame 3 and used for carrying out a holding test, the control key 11 is used for controlling the opening and closing of an instrument, the display screen 4 is used for displaying measurement information, and the control key 11 and the display screen 4 are both arranged on the second handle 2.

The bottom of the first handle 1 and the bottom of the second handle 2 are connected through a wire 5, the two ends of the wire 5 are respectively provided with a BNC interface, and the wire 5 connects the first handle 1 and the second handle 2 together through the BNC interface, so that the disassembly is convenient.

Be provided with square frame 3 on the first in command 1, the voltage circle sets up on square frame 3, and the voltage circle includes first voltage arc circle 6 and second voltage arc circle 7, and first voltage arc circle 6 is fixed to be set up on square frame 3, and second voltage arc circle 7 passes through the movable block setting on square frame 3, and the inside of square frame 3 is stretched into to the bottom of second voltage arc circle 7. First voltage arc circle 6 and second voltage arc circle 7 constitute circular shape voltage circle, the utility model discloses the outer diameter of well voltage circle is about 3cm, and the internal diameter is 1.5cm, and the size ratio is smaller, can be used to the measurement of thin wire and the use in narrower space, provides excitation signal through the voltage circle to produce induced electromotive force and induced-current in the return circuit.

Be provided with square frame 3 on the second handle 2, the electric current circle sets up on square frame 3, and the electric current circle includes first electric current arc circle 8 and second electric current arc circle 9, and first electric current arc circle 8 is fixed to be set up on square frame 3, and second electric current arc circle 9 passes through the movable block setting on square frame 3, and the inside of square frame 3 is stretched into to the bottom of second electric current arc circle 9. First electric current arc circle 8 and second electric current arc circle 9 constitute circular shape electric current circle, the utility model discloses the outer diameter of well electric current circle is about 3cm, the internal diameter is 1.5cm, the size ratio is smaller, can be used to the measurement of thin wire and the use in narrower space, measure the induced current signal that the voltage circle produced, the measuring result calculates the loop impedance inside the instrument, and show the resistance value on the LED screen, if the resistance value of calculating is non-infinity value, then show that the CT return circuit does not have the phenomenon of opening a way, the resistance value that records here is the alternating current impedance in whole CT return circuit really, because CT's inductance is very big, the resistance value of measuring is not the CT direct resistance.

The operating mechanism 10 includes a U-shaped block 101, a pressing spring 102, an operating plate 103, and a connecting rod 105. U type piece 101 sets up on the inside lateral wall of square frame 3, extrusion spring 102 transversely sets up on U type piece 101, the bottom at second voltage arc circle 7 and second electric current arc circle 9 is connected respectively to extrusion spring 102's tip, the top of operation panel 103 articulates on square frame 3's lateral wall, the slide has been seted up on the inner wall of operation panel 103, the bottom at second voltage arc circle 7 and second electric current arc circle 9 is connected to the one end of connecting rod 105, the sliding block 104 sliding fit that the other end set up through the top is on operation panel 103. After pressing operation panel 103, through the rotation of the fan form of operation panel 103, drive connecting rod 105 swing to drive second voltage arc circle 7 or the inside motion in second electric current arc circle 9 bottom, extrusion spring 102 compresses tightly, and second voltage arc circle 7 or the top of second electric current arc circle 9 is opened, can step up the wire that awaits measuring, unclamps operation piece 103, under extrusion spring 102's effect, will await measuring the wire and step up.

The utility model discloses a theory of operation, when needs detect the work, two operation panels are pressed to the manual pressure, voltage circle and current circle are opened, will measure the wire and place in the centre, loosening the operation panel, step up and measure the volume of awaiting measuring wire, measure according to the control key, provide excitation signal through the voltage circle, and produce induced-current potential and induced-current in the return circuit, this induced-current signal is measured to the rethread current circle, calculate the loop impedance inside the instrument, and show the resistance value on the LED screen, if the resistance value of calculating is non-infinity value, then show that the CT return circuit does not have the phenomenon of opening a way.

The utility model discloses whether detecting circuit opens a way under the prerequisite of not breaking the survey CT return circuit, use the structure of two pincers separation, reduced the size and the thickness of keeping silent, easily use in narrow space, reduced the electromagnetic interference between voltage circle and the electric current circle simultaneously, improved the comprehensiveness and the functionality of detector.

Claims (3)

1. Pincerlike CT tester that opens a way, its characterized in that: the device comprises a first handle (1) and a second handle (2) which are connected with each other through a conducting wire (5) at the bottom for handheld measurement, wherein square frames (3) are respectively arranged on the first handle (1) and the second handle (2), and an operating mechanism (10) for testing is arranged in each square frame (3); a voltage ring for generating an excitation signal is arranged on the square frame (3) of the first handle (1), and the voltage ring comprises a first voltage arc-shaped ring (6) fixedly arranged on the square frame (3) and a second voltage arc-shaped ring (7) arranged on the square frame (3) through a movable block; a current ring for measuring induction signals is arranged on the square frame (3) of the second handle (2), and comprises a first current arc ring (8) fixedly arranged on the square frame (3) and a second current arc ring (9) arranged on the square frame (3) through a movable block; and the second handle (2) is provided with a control key (11) for opening and closing the tester and a display screen (4) for displaying measurement information.

2. The split-core CT open circuit tester as claimed in claim 1, wherein: the operating mechanism (10) comprises a U-shaped block (101) arranged on the inner side wall of the square frame (3), an extrusion spring (102) is transversely arranged on the U-shaped block (101), the end part of the extrusion spring (102) is respectively connected to the bottom of the second voltage arc-shaped ring (7) and the bottom of the second current arc-shaped ring (9), a connecting rod (105) is further arranged at the bottom of the second voltage arc-shaped ring (7) and the bottom of the second current arc-shaped ring (9), a sliding block (104) is arranged on the connecting rod (105), and the sliding block (104) is slidably assembled on the inner wall of an operating plate (103) hinged to the outer side wall of the square frame (3) at the top.

3. The split-core CT open circuit tester as claimed in claim 1, wherein: two ends of the wire (5) are respectively connected to the bottoms of the first handle (1) and the second handle (2) through BNC interfaces.

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